Analysis of the Surface of Parts Injected with ABS and Treated with Acetic Acid: Influence of Process Settings - Visual Computing: Scientific Visualization and Imaging Systems - page 143

Chapter 8
Analysis of the Surface of Parts Injected
with ABS and Treated with Acetic Acid:
Influence of Process Settings
R. P. Bom and E. H. Murakami
Abstract This study examined the influence of process settings of Acrylonitrile
Butadiene Styrene (ABS) injection molding on the surface residual stress gener-
ated during the filling, packing, and cooling phases. The thickness of layers of
Cu-Ni-Cr electro deposited by optical microscopy was determined. Several
specimens were injection molded with ABS and treated with different process
parameters. Specimen surfaces were treated with glacial acetic acid for 2 min at
room temperature. Analysis of surfaces by electron microscopy was performed.
This enabled the identification of the influence of injection parameters on surface
morphology after treatment with acid. The correlation of results with the surface
residual stress obtained through simulation was determined. The method used for
determining surface residual stress which damages the electro deposit process
originated from injection mold was experimentally determined upon the absence
or presence of surface bleaching. Upon the interaction of statistical, numerical, and
experimental tools, an equation and a response surface model were established.
From this surface, following an isoline of residual stress, it was experimentally
demonstrated that it is possible to obtain specimens with non-bleached surfaces
with low injection time and packing pressure equal to injection pressure.
Keywords Residual stress Acetic acid Injection settings ABS